We construct an empirical energy distribution for Arcturus from published scans, integrate it to obtain the total flux, and combine the latter with precise interferometric measurements of the limb-darkened angular diameter to derive the effective temperature. We conclude that the best value that can be derived within the framework of the associated assumptions is Teff = 4290 ± 30 K. We then select a grid of model-atmosphere energy distributions by Kurucz and extract Teff/log g/[Fe/H] by a least-squares fit to the adopted energy distribution. With the value of Teff already constrained, we could investigate values for the surface gravity and metallicity of Arcturus; our results are log g = 1.9, [Fe/H] = -0.68, and R = 23 R⊙. However, we discuss evidence that relevant grids of models may not contain sufficient opacity.
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机译：我们根据已发布的扫描结果为Arcturus构造经验能量分布，对其进行积分以获得总通量，然后将后者与肢体暗角直径的精确干涉测量结合以得出有效温度。我们得出结论，可以在相关假设的框架内得出的最佳值为Teff = 4290±30K。然后，我们用Kurucz选择模型大气能量分布的网格，并提取Teff / log g / [Fe / H]通过最小二乘法拟合所采用的能量分布。在已经限制了Teff值的情况下，我们可以研究Arcturus的表面重力和金属性的值。我们的结果是log g = 1.9，[Fe / H] = -0.68，R = 23R⊙。但是，我们讨论了有关模型的相关网格可能不包含足够的不透明度的证据。
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